Dust gun



E. C. BROWN June 4, 1929.

DUST GUN Filed Sept. 26, 1925 Patented June 4, 1929.

' UNITED STATES 1,715,986 PATIENT OFFICE.

EDWARD C. BROWN, OF ROCHESTER, NEW YORK, ASSIGNOR TO THE E. C. BROWNCOM- ]?ANY, OF ROCHESTER, NEW YORK, A CORPORATION OF NEW YORK.

DUST GUN.

Application filed September 26, 1925.

My present invention relates to devices for distributing poweredsubstances; such as, are used in applying chemical to plants to preventtheir destruction by insects and it has for its object to provide asimple, cheap and convenient form of gun whereby preparations inpowdered form may be applied to the plants with the greatest efficiency.The improvements are directed in part toward so assembling the devicethat a maximum pressure will he developed in the powder chamber and thecontents thereof discharged through a restricted orifice under suchgreat pressure and with such force as to drive it eifectively againstthe plant or other surfaces to be treated. The improvements are furtherdirected toward providing convenient construction whereby the parts ofthe gun may be easily assembled. To these and other ends the inventionresides in certain improvements and combinations of parts all as will behereinafter more fully described, the novel features being pointed outin the claim at the end of the specification.

In the drawings:

Figure 1 is a side view of a dust gun, constructed in accordance withand illustrating one embodimentof my invention.

Figure 2 is an enlarged fragmentary, longitudinal, sectional Viewthrough the dust chamber and discharge tube.

Figure 3 is a transverse section on the line 33 of Figure 2.

Figure 4 is a perspective view of one of the heads of the dust chamberand Figure 5 is a fragmentary, sectional View of a modified form ofnozzle.

Similar reference numerals throughout the several views indicate thesame parts.

In the construction and operation of a 7 dust gun it is important that aconsiderable pressure of air be developed suddenly in the dust chamberso that the material will be projected with a sudden force that willcarry it in concentrated form onto and under the leaves of a plant that,for instance, the gun is used to treat. Furthermore it is desirable thatthe gun be cheaply and lightly con structed and have the capability ofbeing readily taken apart to be cleaned or refilled.

WVith these objects in view I have designed a gun which comprises threemajor parts; namely, a pump or compression cylinder 1; a dust chamber orcylinder 2 and 'ure 4.

Serial No. 58,798.

a delivering tube 3 that is capped by a nozzle 4-. The pump cylinder 1is provided with a piston '2 connected by a stem 3" with a handle 4 allof which parts operate in the usual manner of a pump, a suitably packedhead 5 being provided through which. the stem 3" projects.

The pump cylinder 1 is rigidly attached to a head (3 which has a tightjoint with the rear end of the powder container or cylinder tube. Inthis head is a port 7 leading into a cage 8 secured to the forward sideof the head in the interior of the dust chamber; The cage 8 is furtherprovided with a port 9 that discharges into the chamber. cage 8 with theports 7 and 9 form a conduit from the pump to the interior of thechamher, the discharge port of which projects a jet radially of thechamber and against the body of dust contained therein. The port 7 isnormally closed by a valve 10 held in place by a spring 11 locatedwithin the cage. Then the piston 2 is driven inwardly or forwardly itcreates a sudden pressure in the pump cylinder 1 that is communicatedthrough ports 7 and 9 to the dust chamher 2, the valve 10 and its spring11 yielding momentarily under the superior force.

At the far or forward end of the dust chamber 2 is a similar head 12also having a tight connection with the dust cylinder the same beingshown in detail in Fig- It is provided with a forwardly projectingtapered collar 13 opposite to or in alinenient with a discharge port 14in the head 12. The discharge port is covered by a gauze screen 15 whichprevents any lumps in the powder (the body of which is indicated at 16,Figure 2) from reaching the discharge port 14.

The delivering tube 3 fits upon the collar 13 which, as before stated,is tapered, and provides another slip joint at this point whereby thetube 3 may be easily detached from the head 12 and the head 12 may beeasily detached from the powder cylinder 2. The nozzle 1 of the deliverytube 3 is in the nature of a cap piece jammed over the end thereof andis preferably formed as shown in Figures 1 and 2 with a dischargeorifice 17 in its side or top whereby a cone shaped delivery of thepowder is projected upwardly and is adapted to effectively impinge uponthe under side of a plant leaf where insects are accustomed toaccumulate. In some The instances, however, it may be found desirableand effective to have the nozzle formed as shown at 4: in'Figure 5wherein it is provided With a central discharge opening 17 but the tube3 is given an upward curve 18 at its head to furnish same effect.

The port 14 and the discharge opening 17 are preferably of about thesame size and capacity as Well as the port 9 in the cage 8 although port7 may be larger. This equalizes the pressure in the dust chamber 2 andprovides a flow through the discharge tube 3 that gives a Well mixed andforceful cone of dust in the air issuing from the discharge orifice 17.

A dust gun constructed in accordance with my invention may be readilymade of light sheet metal parts and easily assembled while at the sametime the interior parts are always accessible for cleaning or forre-filling the dust chamber tube and by detaching the discharge tube 3the device may be shipped in a knocked down condition to occupy smallspace in a container and yet enable unskilled persons to assemble itupon its receipt.

I claim as my invention:

A spray gun comprising a cylindrical container having inner and outerend. Walls thereon a cylinder extending longitudinally of the containerand having one end thereof connected with and closed by said inner Wallthe latter having a discharge port for the passage of air from thecylinder to the container, said port being located off center Withrespect to the head, valve means carried by the inner Wall forcontrolling the passage of air through said port and for directing itlaterally toward the center of the container, a removable closure uponthe outer Wall having a dust discharge passage, a tubular memberprojecting forwardly from the closure in communication With said passageand a nozzle pipe detachably secured upon said tubular member.

EDWVARD 0. BROWN.

